[Lldb-commits] [PATCH] D91007: [lldb] [Process/FreeBSDRemote] Fix handling user-generated SIGTRAP

[Michał Górny via Phabricator via lldb-commits]

mgorny updated this revision to Diff 304135.
mgorny added a comment.

clang-format


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D91007/new/

https://reviews.llvm.org/D91007

Files:
  lldb/source/Plugins/Process/FreeBSDRemote/NativeProcessFreeBSD.cpp
  lldb/test/API/functionalities/signal/raise/TestRaise.py


Index: lldb/test/API/functionalities/signal/raise/TestRaise.py
===================================================================
--- lldb/test/API/functionalities/signal/raise/TestRaise.py
+++ lldb/test/API/functionalities/signal/raise/TestRaise.py
@@ -30,7 +30,6 @@
         self.signal_test('SIGRTMIN', True)
 
     @skipIfNetBSD  # Hangs on NetBSD
-    @skipIfFreeBSD  # hangs
     def test_sigtrap(self):
         self.build()
         self.signal_test('SIGTRAP', True)
Index: lldb/source/Plugins/Process/FreeBSDRemote/NativeProcessFreeBSD.cpp
===================================================================
--- lldb/source/Plugins/Process/FreeBSDRemote/NativeProcessFreeBSD.cpp
+++ lldb/source/Plugins/Process/FreeBSDRemote/NativeProcessFreeBSD.cpp
@@ -192,7 +192,8 @@
   }
   assert(info.pl_event == PL_EVENT_SIGNAL);
 
-  LLDB_LOG(log, "got SIGTRAP, pid = {0}, lwpid = {1}", pid, info.pl_lwpid);
+  LLDB_LOG(log, "got SIGTRAP, pid = {0}, lwpid = {1}, flags = {2:x}", pid,
+           info.pl_lwpid, info.pl_flags);
   NativeThreadFreeBSD *thread = nullptr;
 
   if (info.pl_flags & (PL_FLAG_BORN | PL_FLAG_EXITED)) {
@@ -240,6 +241,8 @@
 
   if (info.pl_flags & PL_FLAG_SI) {
     assert(info.pl_siginfo.si_signo == SIGTRAP);
+    LLDB_LOG(log, "SIGTRAP siginfo: si_code = {0}, pid = {1}",
+             info.pl_siginfo.si_code, info.pl_siginfo.si_pid);
 
     switch (info.pl_siginfo.si_code) {
     case TRAP_BRKPT:
@@ -248,7 +251,7 @@
         FixupBreakpointPCAsNeeded(*thread);
       }
       SetState(StateType::eStateStopped, true);
-      break;
+      return;
     case TRAP_TRACE:
       if (thread) {
         auto &regctx = static_cast<NativeRegisterContextFreeBSD &>(
@@ -272,9 +275,14 @@
       }
 
       SetState(StateType::eStateStopped, true);
-      break;
+      return;
     }
   }
+
+  // Either user-generated SIGTRAP or an unknown event that would
+  // otherwise leave the debugger hanging.
+  LLDB_LOG(log, "unknown SIGTRAP, passing to generic handler");
+  MonitorSignal(pid, SIGTRAP);
 }
 
 void NativeProcessFreeBSD::MonitorSignal(lldb::pid_t pid, int signal) {



Index: lldb/test/API/functionalities/signal/raise/TestRaise.py
===================================================================
--- lldb/test/API/functionalities/signal/raise/TestRaise.py
+++ lldb/test/API/functionalities/signal/raise/TestRaise.py
@@ -30,7 +30,6 @@
         self.signal_test('SIGRTMIN', True)
 
     @skipIfNetBSD  # Hangs on NetBSD
-    @skipIfFreeBSD  # hangs
     def test_sigtrap(self):
         self.build()
         self.signal_test('SIGTRAP', True)
Index: lldb/source/Plugins/Process/FreeBSDRemote/NativeProcessFreeBSD.cpp
===================================================================
--- lldb/source/Plugins/Process/FreeBSDRemote/NativeProcessFreeBSD.cpp
+++ lldb/source/Plugins/Process/FreeBSDRemote/NativeProcessFreeBSD.cpp
@@ -192,7 +192,8 @@
   }
   assert(info.pl_event == PL_EVENT_SIGNAL);
 
-  LLDB_LOG(log, "got SIGTRAP, pid = {0}, lwpid = {1}", pid, info.pl_lwpid);
+  LLDB_LOG(log, "got SIGTRAP, pid = {0}, lwpid = {1}, flags = {2:x}", pid,
+           info.pl_lwpid, info.pl_flags);
   NativeThreadFreeBSD *thread = nullptr;
 
   if (info.pl_flags & (PL_FLAG_BORN | PL_FLAG_EXITED)) {
@@ -240,6 +241,8 @@
 
   if (info.pl_flags & PL_FLAG_SI) {
     assert(info.pl_siginfo.si_signo == SIGTRAP);
+    LLDB_LOG(log, "SIGTRAP siginfo: si_code = {0}, pid = {1}",
+             info.pl_siginfo.si_code, info.pl_siginfo.si_pid);
 
     switch (info.pl_siginfo.si_code) {
     case TRAP_BRKPT:
@@ -248,7 +251,7 @@
         FixupBreakpointPCAsNeeded(*thread);
       }
       SetState(StateType::eStateStopped, true);
-      break;
+      return;
     case TRAP_TRACE:
       if (thread) {
         auto &regctx = static_cast<NativeRegisterContextFreeBSD &>(
@@ -272,9 +275,14 @@
       }
 
       SetState(StateType::eStateStopped, true);
-      break;
+      return;
     }
   }
+
+  // Either user-generated SIGTRAP or an unknown event that would
+  // otherwise leave the debugger hanging.
+  LLDB_LOG(log, "unknown SIGTRAP, passing to generic handler");
+  MonitorSignal(pid, SIGTRAP);
 }
 
 void NativeProcessFreeBSD::MonitorSignal(lldb::pid_t pid, int signal) {

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